I would like to know if a fake data generator exists for Java. In Perl exists Data::Faker and there's a port to Ruby called faker, for JavaScript faker.js. Someone know about a fake data generator for Java, that can provide random names, phone number, P.O. box number, etc...

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I've never seen something like this (in the libraries java is shipping with). Maybe there is a 3rd party library that does that for you in Java. In this case you should use a search engine to find out :)
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Thomas JungblutJun 15 '11 at 19:25